The Nearctic is one of Earth's eight ecozones. The Nearctic covers most of North America, Greenland, and the highlands of Mexico. Southern Mexico, southern Florida, Central America, and the Caribbean are part of the Neotropic ecozone. The World Wildlife Fund divides the Nearctic into four bioregions. These four regions are the Canadian Shield, Eastern North America, Western North America, and Northern Mexico.
The Canadian Shield bioregion extends across northern North America from the...